S04.2
Non-billableInjury of trochlear nerve
Injury of trochlear nerve
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Injury of 4th cranial nerve
Includes
Conditions included under this code
- injuries of ear
- injuries of eye
- injuries of face [any part]
- injuries of gum
- injuries of jaw
- injuries of oral cavity
- injuries of palate
- injuries of periocular area
- injuries of scalp
- injuries of temporomandibular joint area
- injuries of tongue
- injuries of tooth
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •burns and corrosionsT20-T32
- •effects of foreign body in earT16
- •effects of foreign body in larynxT17.3
- •effects of foreign body in mouth NOST18.0
- •effects of foreign body in noseT17.0-T17.1
- •effects of foreign body in pharynxT17.2
- •effects of foreign body on external eyeT15
- •frostbiteT33-T34
- •insect bite or sting, venomousT63.4
Code First
The underlying condition must be sequenced before this code
Use Additional Code
Additional codes that should follow this code
Code Also
A second code may be required; sequencing depends on circumstances
- for any associated infection
- any associated:
- •open wound of headS01
- •skull fractureS02
Child Codes (3)
Related Codes(9)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(44)
UMLS
- Cranial Nerve IV InjuryC0161405
- Fourth Cranial Nerve InjuriesC0161405
- Fourth Cranial Nerve InjuryC0161405
- Fourth Nerve Palsy, TraumaticC0161405
- Fourth Nerve TraumaC0161405
- Fourth cranial nerve injuryC0161405
- Fourth-Nerve Palsies, TraumaticC0161405
- Fourth-Nerve Palsy, TraumaticC0161405
- Fourth-Nerve TraumaC0161405
- Fourth-Nerve TraumasC0161405
- IVth nerve injuryC0161405
- Injuries, Trochlear NerveC0161405
- Injury of fourth cranial nerveC0161405
- Injury of trochlear nerveC0161405
- Injury to trochlear nerveC0161405
- Injury, Cranial Nerve IVC0161405
- Injury, Fourth Cranial NerveC0161405
- Injury, Trochlear NerveC0161405
- Nerve Injuries, TrochlearC0161405
- Nerve Injury, TrochlearC0161405
- Nerve Trauma, TrochlearC0161405
- Nerve Traumas, TrochlearC0161405
- Neuropathies, Traumatic TrochlearC0161405
- Neuropathy, Traumatic TrochlearC0161405
- Palsies, Traumatic Fourth-NerveC0161405
- Palsy, Traumatic Fourth-NerveC0161405
- Trauma, Fourth-NerveC0161405
- Trauma, Trochlear NerveC0161405
- Traumas, Fourth-NerveC0161405
- Traumas, Trochlear NerveC0161405
- Traumatic Fourth Nerve PalsyC0161405
- Traumatic Fourth-Nerve PalsiesC0161405
- Traumatic Fourth-Nerve PalsyC0161405
- Traumatic Trochlear NeuropathiesC0161405
- Traumatic Trochlear NeuropathyC0161405
- Trochlear Nerve InjuriesC0161405
- Trochlear Nerve InjuryC0161405
- Trochlear Nerve TraumaC0161405
- Trochlear Nerve TraumasC0161405
- Trochlear Neuropathies, TraumaticC0161405
- Trochlear Neuropathy, TraumaticC0161405
- Trochlear nerve injuryC0161405
- Trochlear nerve injury (disorder)C0161405
- Injury of 4th cranial nerveC2831704
Frequently Asked Questions
What is the ICD-10 code for injury of trochlear nerve?
The ICD-10-CM code for injury of trochlear nerve is S04.2. The full clinical description is "Injury of trochlear nerve". S04.2 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code S04.2 mean?
ICD-10-CM code S04.2 represents “Injury of trochlear nerve”. It is classified under Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes and is a non-billable header code. Use a more specific child code for billing purposes.
Is S04.2 a billable code?
No, S04.2 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 3 child codes under S04.2.
What chapter is S04.2 in?
S04.2 is in Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (codes S00-T88).
What codes cannot be used with S04.2?
S04.2 has Excludes1 notes indicating codes that cannot be used together with it, including: birth trauma (P10-P15); obstetric trauma (O70-O71).
What are the subcategories under S04.2?
S04.2 has 3 child codes, including: S04.20 (Injury of trochlear nerve, unspecified side), S04.21 (Injury of trochlear nerve, right side), S04.22 (Injury of trochlear nerve, left side).
Are additional codes required with S04.2?
Yes, when using S04.2, also report: any retained foreign body, if applicable (Z18.-).
What are the UMLS CUIs for S04.2?
S04.2 is linked to 2 UMLS Concept Unique Identifiers: C0161405, C2831704. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does S04.2 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like injury of trochlear nerve affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of S04.2?
S04.2 maps to the ICD-11 code: NA04.3 (Injury of trochlear nerve).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.